Air Asia — no refund on airport tax for not travelling

Address:	Ranga Reddy, Andhra Pradesh, 500019
Website:	airasia.com

I had a flight from da nang to kuala lumpur on aug 13, 2018 (Ak 649) and from kuala lumpur to hyderabad on aug 13, 2018 (Ak 69). Booking reference - fi2c8l and tl2s5f. I did not show up for both the flights and have been trying to get refund of airport tax. No update from air asia so far and it has been over a month. Please help with regards to this.

Attaching both the e-tickets for reference.

Thanks!
Chetna